Personally, follow a lot of musicians, bands, and labels I like. The channels I watch the most though are pretty eclectic.

First and foremost, I watch Casey Neistat every single day. The man is endlessly interesting and constantly working, which gives me a good boost of motivation when I need it. To make me chuckle I follow Brad Hall and GradeAUnderA. CGP Grey and Brusspup are great for obscure knowledge drops. I'm also really into RetroSnickers for some reason. I'm no sneaker-head, but shoe restoration fascinates me.

Dead Kevin is the only channel I've ever followed. It's a hilarious sketch comedy group of three roommates in LA. They are retired though and focusing on individual efforts to be stand up comedians. One was in an episode of New Girl, and another was on Conan and a Stardust commercial pus various comedy tours, etc. They're all talented. I went to college with Ahmed, these guys are going to be successful in the biz. Look up Dead Kevin, watch a video.